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Macrophages that do not move, they are attached to wide blood vessels (sinuses or sinusoids).
What else can I help you with?
How might an animal be free moving at one stage in its life and sessile at another?
An animal may be free moving during its larval or juvenile stage when it needs to search for food, mates, or new habitats. However, as it transitions into adulthood, it may become sessile to attach itself to a substrate for protection, reproduction, or to optimize feeding efficiency. This strategy allows for better survival and propagation in different stages of life.
What is a sessile feeder?
(sponges) animals with no tissue and with no definite body plan; they are sessile (they dont move), and they are filter-feeders; they contain choanocytes, which are flagellated cells that serve to keep water moving in through pores in teh sides of the body and out through a large opening at the top; other cells called amoebocytes secrete supporting structures which help hold the sponge upright, these structures can be hard, sharp, crystal-like structures called "spicules" Animals(sponges) with no tissue. They are sessil (they dont move), and are filter feeders. They house choanocytes, which are flagellated cells that keep water moving through pores in ten sides of the body.
